2c251d845c
net/socket, net/tcp, net/udp: Add logic to select the domain of the outputgoing packet before sending any UDP or TCP packet. This sets the bit to indicate the IPv4 or IPv6 domain and the correct offset to the output going payload data.
275 lines
8.7 KiB
C
275 lines
8.7 KiB
C
/****************************************************************************
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* net/udp/udp_input.c
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* Handling incoming UDP input
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*
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* Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Adapted for NuttX from logic in uIP which also has a BSD-like license:
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*
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* Original author Adam Dunkels <adam@dunkels.com>
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* Copyright () 2001-2003, Adam Dunkels.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#if defined(CONFIG_NET) && defined(CONFIG_NET_UDP)
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#include <debug.h>
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#include <nuttx/net/netconfig.h>
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#include <nuttx/net/netdev.h>
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#include <nuttx/net/udp.h>
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#include <nuttx/net/netstats.h>
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#include "devif/devif.h"
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#include "utils/utils.h"
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#include "udp/udp.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Public Variables
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****************************************************************************/
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/****************************************************************************
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* Private Variables
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: udp_input
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*
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* Description:
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* Handle incoming UDP input
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*
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* Parameters:
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* dev - The device driver structure containing the received UDP packet
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* udp - A pointer to the UDP header in the packet
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* udpiplen - Length of the IP and UDP headers
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*
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* Return:
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* OK The packet has been processed and can be deleted
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* ERROR Hold the packet and try again later. There is a listening socket
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* but no receive in place to catch the packet yet.
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*
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* Assumptions:
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* Called from the interrupt level or with interrupts disabled.
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*
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****************************************************************************/
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static int udp_input(FAR struct net_driver_s *dev, unsigned int iplen)
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{
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FAR struct udp_hdr_s *udp;
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FAR struct udp_conn_s *conn;
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unsigned int udpiplen;
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unsigned int hdrlen;
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int ret = OK;
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/* Update the count of UDP packets received */
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#ifdef CONFIG_NET_STATISTICS
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g_netstats.udp.recv++;
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#endif
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/* Get a pointer to the UDP header. The UDP header lies just after the
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* the link layer header and the IP header.
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*/
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udp = (FAR struct udp_hdr_s *)&dev->d_buf[iplen + NET_LL_HDRLEN(dev)];
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/* Get the size of the IP header and the UDP header */
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udpiplen = iplen + UDP_HDRLEN;
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/* Get the size of the link layer header, the IP header, and the UDP header */
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hdrlen = udpiplen + NET_LL_HDRLEN(dev);
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/* UDP processing is really just a hack. We don't do anything to the UDP/IP
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* headers, but let the UDP application do all the hard work. If the
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* application sets d_sndlen, it has a packet to send.
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*/
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dev->d_len -= udpiplen;
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#ifdef CONFIG_NET_UDP_CHECKSUMS
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dev->d_appdata = &dev->d_buf[hdrlen];
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if (udp->udpchksum != 0 && udp_chksum(dev) != 0xffff)
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{
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#ifdef CONFIG_NET_STATISTICS
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g_netstats.udp.drop++;
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g_netstats.udp.chkerr++;
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#endif
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nlldbg("Bad UDP checksum\n");
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dev->d_len = 0;
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}
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else
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#endif
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{
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/* Demultiplex this UDP packet between the UDP "connections".
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*
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* REVISIT: The logic here expects either a single receive socket or
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* none at all. However, multiple sockets should be capable of
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* receiving a UDP datagram (multicast reception). This could be
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* handled easily by something like:
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*
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* for (conn = NULL; conn = udp_active(dev, udp); )
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*
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* If the callback logic that receives a packet responds with an
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* outgoing packet, then it will over-write the received buffer,
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* however. recvfrom() will not do that, however. We would have to
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* make that the rule: Recipients of a UDP packet must treat the
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* packet as read-only.
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*/
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conn = udp_active(dev, udp);
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if (conn)
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{
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uint16_t flags;
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/* Set-up for the application callback */
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dev->d_appdata = &dev->d_buf[hdrlen];
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dev->d_sndlen = 0;
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/* Perform the application callback */
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flags = udp_callback(dev, conn, UDP_NEWDATA);
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/* If the operation was successful, the UDP_NEWDATA flag is removed
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* and thus the packet can be deleted (OK will be returned).
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*/
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if ((flags & UDP_NEWDATA) != 0)
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{
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/* No.. the packet was not processed now. Return ERROR so
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* that the driver may retry again later.
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*/
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ret = ERROR;
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}
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/* If the application has data to send, setup the UDP/IP header */
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if (dev->d_sndlen > 0)
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{
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udp_send(dev, conn);
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}
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}
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else
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{
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nlldbg("No listener on UDP port\n");
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dev->d_len = 0;
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}
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}
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return ret;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: udp_ipv4_input
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*
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* Description:
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* Handle incoming UDP input in an IPv4 packet
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*
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* Parameters:
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* dev - The device driver structure containing the received UDP packet
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*
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* Return:
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* OK The packet has been processed and can be deleted
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* ERROR Hold the packet and try again later. There is a listening socket
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* but no receive in place to catch the packet yet.
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*
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* Assumptions:
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* Called from network stack logic with the network stack locked
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPv4
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int udp_ipv4_input(FAR struct net_driver_s *dev)
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{
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/* Configure to receive an UDP IPv4 packet */
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udp_ipv4_select(dev);
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/* Then process in the UDP IPv4 input */
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return udp_input(dev, IPv4_HDRLEN);
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}
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#endif
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/****************************************************************************
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* Name: udp_ipv6_input
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*
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* Description:
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* Handle incoming UDP input in an IPv6 packet
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*
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* Parameters:
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* dev - The device driver structure containing the received UDP packet
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*
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* Return:
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* OK The packet has been processed and can be deleted
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* ERROR Hold the packet and try again later. There is a listening socket
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* but no receive in place to catch the packet yet.
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*
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* Assumptions:
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* Called from network stack logic with the network stack locked
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPv6
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int udp_ipv6_input(FAR struct net_driver_s *dev)
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{
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/* Configure to receive an UDP IPv6 packet */
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udp_ipv6_select(dev);
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/* Then process in the UDP IPv6 input */
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return udp_input(dev, IPv6_HDRLEN);
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}
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#endif
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#endif /* CONFIG_NET && CONFIG_NET_UDP */
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